Boiler with water wall tubes



Oct. 11, 1932. w, HELLER 1,882,422

BOILER WITH WATER WALL TUBES Filed Oct. 51, 1928 2 Sheets-Sheet 1INVENTOR zao-wwfl/dl/ ATTORNEY Oct. 11, 1932. 1.. w. HELLER 1,382,422

BOILER WITH WATER WALL TUBES Filed Oct. 31, 1928 2 Sheets-Sheet '2INVENTOR ind- 4 BY Q W F182.

Patented Oct. 11, 1932 UNITED STATES PATEN'T OFFICE LEWIS W. HELLER, OFOAK HARBOR, OHIO, ASSIGNOR T FULLER LEHIGH COMPANY,

OF FULLERTON, PENNSYLVANIA, A CORPORATION OF DELAWARE BOILER WITH WATERWALL TUBES Application filed October 31, 1928. Serial N0. 316,165.

This invention relates to a boiler that is located above its furnace.The furnace is provided with water wall tubes connected to thecirculating system of the boiler in such a manner that not all of thewater will be drained out of the boiler in case a furnace wall tubebursts. The invention will be described in connection with a boiler ofthe Stirling type.

The invention will be understood from the description in connection withthe accompanying drawings in which Fig. 1 is a vertical section throughan illustrativeembodiment of the invention, and Fig.2 is a verticalsection taken at right angles to Fig. 1.

In the drawings reference character 1 indicates a furnace that may befired for example by means of the burners 1. A boiler of the Stirlingtype is located above the furnace and comprises the usual upper steamand water drums 2 connected to the lower or mud drum 3 by banks of tubes4, 5, and 6 with bafiies 7 to guide the hot products of combustion fromthe furnace 1 across the tubes and into the outlet 8 in the usualmanner. A superheater 9, located between the banks 4 and 5, is connectedto one of the steam and water drums 2 by means of the pipe 9.

In order to avoid the danger of all of the water being drained from theboiler in case a furnace wall tube bursts, the furnace wall tubes areconnected to the water space of one of the steam and water drums 2 inthe following manner :A group of tubes 10 at each end of one of the rowsof tubes in one of the banks of tubes connecting the upper drums 2 tothe lower drum 3 is connected to horizontal headers 11 located betweenthe upper and lower drums. The groups of tubes 10 are indicated in thedrawings as being in the front row of the bank of tubes 5, but it is tobe understood that tubes in other rows may be connected similarly forthis purpose. Tubes 12 connect the headers 11 on opposite sides of thefurnace to the opposite ends of a header 13 located at the lower part ofthe rear furnace wall near the ash hopper 14. Tubes 15 on opposite sidesof the furnace also connect the headers 11 to a lower header 16 at thelower edge of the front wall of the furnace; Tubes 17 on opposite sidesof the furnace also connect the headers 11 to lower headers 18 locatedalong opposite sides of the furnace.

A row of furnace wall tubes 20 connects the header 13 to an upper header21. One or more recirculating tubes 22, located outside of the furnace,connect the upper header 21 to the lower header 13. Tubes 23 locatedoutside of the furnace connect the header 21 to the steam space of oneof the steam and water drums 2. r

A row of furnace wall tubes 24 connects the lower header 16 to the upperheader 25 and a row of furnace wall tubes 26 connects the header 25 tothe steam and water drum 2. Rows of side wall furnace tubes 27 connectthe headers 18 to the upper headers 28 and recirculating tubes 29outside of the furnace walls connect the headers 28 to the headers 18.Tubes 30 connect the headers 28 to the steam space of one of the steamand water drums 2.

The operation is as follows a The water level in the Stirling boiler ismaintained in the usual manner and water for the furnace wall tubes isfurnished by the water passing through the tubes 10 into the headers 11from which it passes through the pipes 12, 15 and 17 to the lowerfurnace wall tube headers 18, 16 and 18. The water or mixture of steamand water passes upwardly through the furnace wall tubes 20, 24 and 27into the upper headers 21', 25 and 28. Steam and water pass through thetubes 23 from the header 21 and the tubes 30 from the headers 28 intothe steam and water drum 2. Steam and water pass from the header 25through the water wall tubes 26 into one of the steam and water drums 2.The water circulates through the Stirling boiler in the usual manner. Ifa furnace wall tube bursts only enough water is drained out of theStirling boiler to lower the water level to the level of the lower endsof the tubes 10, thus decreasing or eliminating the danger of theStirling boiler steam generating tubes becoming burned.

- of said boiler, and

I claim:

1. In a boiler having a steam and water chamber and steam generatingtubes below said chamber connected thereto, a furnace having water walltubes connected to some of said steam generating tubes in such a mannerthat rupturing of one of said wall tubes will not cause the water todrain out of said boiler to a level below the lower ends of any of thesteam generating tubes of said boiler.

2. In a boiler having a steam and water chamber and steam generatingtubes below said chamber connected thereto, a furnace having water walltubes with the water inlet end of said furnace wall tubes connected tosome of said steam generating tubes above the lovlyer ends of all ofsaid steam generating tu es.

3. In a boiler having a steam and water chamber and steam generatingtubes below said chamber connected thereto, a furnace having water walltubes with the water inlet end of said furnace wall tubesconnected tosome of said steam generating tubes a considerable distance above thelower ends of all of said steam generating tubes, and the steam end ofsaid wall tubes being connected to the steam space of said boiler.

4. In combination, a Stirling boiler having an upper drum and a lowerdrum, steam generating tubes connecting said drums, and a furnace belowsaid boiler having water wall tubes, one end of said wall tubes beingconnected to the steam space of an upper drum the other end of said walltubes being connected to gas heated steam generating tubes of saidboiler at a point intermediate its upper and lower drums.

5. In combination, a Stirling boiler having a lower drum and a pluralityof connected upper drums, banks of steam generating tubes connectingsaid lower drum to said upper drums, and a furnace below said boilerhaving water wall tubes, .some of the tubes in a bank of the Stirlingboiler tubes being connected at a point intermediate the ends of saidtubes to the lower ends of said water wall tubes, and a connection fromthe upper ends of said wall tubes to the steam space of said boiler.

6. In combination, a Stirling boiler having a lower drum and a pluralityof connected upper drums, steam generating tubes connecting said lowerdrum to said upper drums, a furnace below .said boiler having water walltubes, a connection from some of the tubes in a. bank of the Stirlingboiler tubes at a point intermediate the ends of said tubes to the lowerends of said water wall tubes, headers interposed in said connection,and a connection from the upper ends of said wall tubes to the steamspace of said boiler.

7. In combination, a boiler comprising an upper chamber and a lowerchamber connected by a plurality of steam generating tubes, and afurnace below said boiler having wall cooling tubes, one end of saidtubes being connected to the steam space of said upper chamber and theother end to one of the steam generating boiler tubes chambers.

8. In combination, a Stirling boiler having a. lower drum and aplurality of connected upper drums, steam generating tubes connectingsaid lower drum to said upper drums, a furnace below said boiler havingwater wall tubes, headers connected in a bank of the Stirling boilertubes, connections from said headers to said water wall tubes at a pointintermediate the ends of saidsteam generating tubes, and a connectionfrom the upper ends of said wall tubes to the steam space of saidboiler.

9. In combination, a Stirling boiler having a lower drum and a pluralityof connected upper drums, steam generating tubes connecting said lowerdrum to said upper drums, a furnace below said boiler having water walltubes, headers connected in a bank of the Stirling boiler tubes, andconnections from said headers to said water wall tubes at a pointintermediate the ends of said steam generating tubes, said connectionslying out side of said boiler setting, and a connection from the upperends of said wall tubes to the steam space of said boiler.

LEWIS W. HELLER.

connecting said

